Polarization-maintaining photonic-crystal-fiber-based all-optical polarimetric torsion sensor

An application of a polarization-maintaining photonic crystal fiber (PM-PCF) for torsion sensing is proposed and experimentally demonstrated. The response of the sensor is theoretically validated using the Jones matrix. High normalized sensitivity of ~0.014/[degrees] was measured within a linear twist angle range from 30[degrees] to 70[degrees]. The sensor response was observed to be highly repeatable over a 90[degrees] twist in both the clockwise and counterclockwise directions. The proposed sensor exhibits reduced temperature sensitivity due to the low thermal coefficient of PM-PCF, making it an ideal candidate for torsion sensing. OCIS codes: 060.2370, 060.3735.